Selection form add in case not found

[Mr.Aky]

Iìd like to know if it exists a way to add a name in a list (Selection form) if the name is not already present.

Case:
I have a selection form from a text file.

In the text file I have three texts
January
February
March

I search for April, I do not find it.
I write April and the form wors as expected.

I'd like April to be present in next search. How can I archive this result?

https://www.screenpresso.com/=OHII5E32thcL

[Marko]

You would need to edit the text file and add another item, like you did when creating the file.